Hydrokinetic turbine performance depends on different parameters such as blade geometrical parameters (i.e. chord length, blade pitch angle, hydrofoil shape, blade yaw angle and etc.) Kinematic parameters (i.e. water speed, rotational speed and etc.) and another important parameters include tip speed ratio (TSR) and The location of turbine in the Channel or river bed. In this project Computational fluid dynamics (CFD) and commercial software ANSYS Fluent 16 are used to simulate hydrokinetic turbine. In numerical simulation used multiple reference frame (MRF) model and the shear-stress transport k-ω SST turbulence model. the grid independency is studied To ensure of numerical results. Also the results are validated with experimental data. At first, for investigate the effect of blade pitch angle and chord length on power coefficient, three different chord length were considered and blade pitch angle over a range of blade pitch angles (0° to 16°) with TSR (2.17 to 6.22) are studied and The results show that maximum power coefficient was found at 10 ° blade pitch angle with 1.676 cm chord length. Based on the results, stall delay depends on blade pitch angle and chord length.